the image of bill clinton at robben island, what an amazing treat to see that up close. >> you've got world leaders going there, including he was very critical of george w. bush over the iraq war and bush is heading down there. he was critical of the united states way back in 2003. i think he said if there's a krntd has committed unspeakable an frosties, it is the united states. this is a man who spoke from the heart and people respected him for na. >> can too i along time for the u.s. to divest in investments in south africa. the funeral for nelson mandela will be one of the biggest funerals the world has ever seen. officials preparing to welcome more than 91 current, former heads of state for this memorial. and president obama en route along with former president george w. bush. rare they're on air force one together. decided to get a ride. >> hitched a ride. they're going to be joined, of course, by former presidents bill clinton who was also close to any son mandela, as you said, and jimmy carter, too. he's going for the memorial service. some other world leaders who plan to atten